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Loans and allowance for credit losses - Narrative (Details) - USD ($) |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 15, 2020 | Mar. 22, 2020 | Feb. 14, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |  |
Accrued interest receivable |  |  |  |  | $ 38,316,000 |  |
Accretion of interest income |  |  |  |  | 3,788,000 | $ 8,556,000 | $ 7,608,000
Total accretion excluded interest income |  |  |  |  |  | 8,556,000 | 7,608,000
Recorded investment in TDRs |  |  |  |  | 15,988,000 | 12,206,000 |
Allocation to specific reserves |  |  |  |  | 310,000 | 360,000 |
Commitment to lend additional amounts to troubled debt restructuring |  |  |  |  | 0 | 0 |
TDRs classified as non-accruals |  |  |  |  | 8,279,000 | 5,201,000 |
Payment default for loans modified as troubled debt restructurings |  |  |  |  | 0 | 0 | 0
Classification of TDR, exemption period, CARES ACT |  | 60 days |  |  |  |  |
Deferred loans that were transferred to normal payment status |  |  |  |  | 1,399,088,000 |  |
PCI Loans |  |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |  |
Carrying value of PCI loans |  |  |  |  |  | 57,152,000 | 68,999,000
Purchase accounting liquidity discount |  |  |  |  |  | 292,000 | 2,436,000
Purchase accounting non accretable credit discount |  |  |  |  |  | 3,537,000 | 4,355,000
Accretion of interest income |  |  |  |  |  | 7,003,000 | 9,010,000
Non-PCI Loans |  |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |  |
Purchase accounting liquidity discount |  |  |  |  |  | 3,924,000 | 2,197,000
Purchase accounting accretable credit discount |  |  |  |  |  | 8,964,000 | $ 7,527,000
Minimum |  |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |  |
Payment deferral period |  |  |  | 60 days |  |  |
Maximum |  |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |  |
Payment deferral period |  |  |  | 90 days |  |  |
Federal Reserve Bank |  |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |  |
Pledged loans to the Federal Reserve Bank |  |  |  |  | 2,463,281,000 | 1,407,662,000 |
Residential Mortgage Loans | FHLB Cincinnati |  |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |  |
Pledge loans to the Federal Home Loan Bank securing advances |  |  |  |  | 1,248,857,000 | 412,966,000 |
Commercial Loan | FHLB Cincinnati |  |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |  |
Pledge loans to the Federal Home Loan Bank securing advances |  |  |  |  | $ 1,532,749,000 | $ 545,540,000 |
Franklin Financial Network, Inc. |  |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |  |
Increase in allowance for credit losses | $ 77,653,000 |  |  |  |  |  |
Farmers National |  |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |  |
Increase in allowance for credit losses |  |  | $ 4,494,000 |  |  |  |

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